I don't feel adequate in the slightest to the task of talking about Journey after only playing an hour of it. But I want to register here that I've started this new practomime, and it makes me think that a relationship between ethics and aesthetics, arising out of inherited mechanics but transcending them, is gathering steam.
Everything you hear about the "multiplayer" (scare-quotes because it's not multiplayer according to most previous understandings of the term) is true, but only scratches the surface. There is much work to do here, both in elaborating the practomime (that is, playing the game) and in reading its effects.